Moriya, Seiji2014-01-172014-01-172012http://hdl.handle.net/2003/3244010.17877/DE290R-13896I considered the educational significance of the Sundial in mathematics education from several points of view; the improvement of geometry education, the development of mathematical modelling, the cultural history of mathematics and the interrelationship of mathematics and science.enGesellschaft für Didaktik der Mathematik510conference contribution